Chemistry



Nov. 21, 1944.

w. P. M DORMAN 2,363,188

CHEMISTRY Filed Sept. 25, 1940 Sheets-Sheet l I] I I I I ,4, I

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ATTORNEYS Nov. 21, 1944. w. MCDQRMAN 2,363,188

CHEM I STRY Filed Sept. 25, 1940 2 Sheets-Sheet 2 96 I 3 I m3,

u l a 4 50 I an BY 777 C INVENTOR.

ATTORNEYS Patented Nov. 21, 1944 I I UNITED STATES PATENT oFFicE- CHEMISTRY William Paullin McDoi-man, Dayton, Ohio, as-

signor to General Motors Corporation, Dayton, 1 Ohio, a corporation of Delaware Application September 25, 1940, Serial No. 358,340 3 Claims. (Cl. 210-183) Thi invention relates to chemistry and mor move the solid material from the screen and keep particularly to filtering means and a method or it in suspension. filtering for reclaimed paint and general filter- Referring now to the drawin s and more pering purposes. ticularly to Fig. 1 there is shown a filtering ar- I have found that ordinary filtering devices ra s t i which the fi e devices 22 clog readily. I believe this to be partly due to and 24 are connected in series. The details of the fact that both sides of the filter are not each of these devlces r Shown n i 3 wh c kept flood d or wetted and partly due to the fact is a sectional view of the filtering device 20. This vices connected in series;

that no means-are provided for preventing t device includes an outer receptacle formed of accumulation of solid upon the filt r a bottom plate 26 and a vertical cylinder 28 which It is an Object f my invention to provide an rests upon and has its lower edge welded to the improved filtering deviCe in which clogging is upper surface of the bottom plate 26. The top eliminated of the cylinder 28 is provided with a ring 30 It is another object of my invention to which receives an annular gasket 32. Also, vide an improved filt ring device in which both welded to the cylinder 28 are the swivel screws sides of the filter are kept fiooded or wetted. 34 Provided wlth wing nuts 36 for fastening the It is another object of my invention to protop cover or lid 38 the cylinder This lid 38 is provided with an annular projection t i g ig gg gi g g ggggg g gi gg gg g gg 40 which enters into sealing engagement with material to prevent clogging the gasket 32 in order to seal the outer receptacle. It is still another object of my invention to t 'Il'he'boztom ifi i 26 ispmvidetd z fi' provide an improved filtering device in. which aper w m recelwis e 8 both sides of the filter are kept wetted or flooded bottom plate 26 also provided wlth packing together with an agitating means for agitating gland for seam-lg i tube 42 in the aperture the material to prevent clogging The upper end of this tube 42 connects to the It is another object of my invention to probottom of the inner receptacle Two vide a filterin arrangement in which several of filtermg screen.s are employed The outer filtermy improved filtering devices are connected in Elisa??? f ggg g g il g g sg zg i series beginning with a coarse filter and ending These screens are made cylindrical in shape and with fine filter" are wrapped around a lower ring 52, provided It is another obJect of my invention to proupon flared bottom 46 and an upper ring 5 vide a method of filtering wherein clogging of A clamping ring 55 clanlps the lower edge of the the filter is prevented.

screens upon the ring 52 while a clamping ring 58 clamps the upper edge of the screens to the a ring 54. The ring 54 makes a substantially tight fit with the ring 60 which is fastened by screws to the lid 62. The screens may be made in one or more sections which have their ends clamped together in order to seal the Joint between the ends of the sections. One set of these clamps 64 is clearlyshown in Fig. 3. Where the screens are made of a single rectangular piece, only one set of clamps is required. When more pieces are Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings, wherein a preferred form of the present invention is clearly shown.

In the drawings: 4|)

Fig. 1 is a view in elevation of my improved filtering arrangement showing three filtering de-' Fig. 2 is a top view of the paddle of the agitat ins m ns; nd used, more sets of clamps are required.

Fig. 3 1s a vertical sectional view through one In t particular i t h t of the filtering devices shown in Fig. 1- terial to be filtered is introduced through. the

v. I have Shown a filtering device made elbow 66 which is threaded into a threaded of an inner and outer receptacle with the inner flanged opening 53 in t cover 3a This receptacle having its Walls form d -Of a fi troduces the material into the inner receptacle mesh filter screen. An overflow type outlet is which includes the screens 48 and 50. The "tube provided for kee ing both receptacles flooded 42 is closed at its lower end by a hand valve with the material being filtered. A paddle is 10. Normally, the liquid which filters through rotated within the inner receptacle in order to the screens would be drawn ofi as fast as it acagitate the material being filtered so as to re- 5 cumulates. However, in my improved invention,

I keep the outer receptacle flooded ,with the liquid which passes through the screens. In order to do this, I provide an outlet 12 in the bottom plate 26 to which is connected a T I4 which is plugged at its lower end and connected on the side to an elbow 16 which in turn connects to a hand valve 18. The hand valve 18 is connected by a pipe section 80 to an elbow 82 which in turn connects to the union 84. The union 84 then connects to a T 86 which is connected to the inlet 88 for the filtering device 22. The top of the 'r 86 is connected by tubing 90 to the upper portion of the outer receptacle 26 in order to prevent the goose-neck type connection between the filtering device from becoming a syphon.

Thus, by this arrangement the level of liquid which is filtered through the screens is always maintained up to the level of the upper portion of the goose-neck connection. I find that this arrangement aids materially in preventing clogging of solid material upon the screen 50.

In order to further prevent this clogging, I provide an agitating means including a. threebladed paddle 92 provided at the bottom of an agitating shaft 94 within the inner receptacle. This shaft extends through a packing gland 98 provided in the cover 38 and the upper end of the shaft 94 is connected by a sleeve 98 to an agitator means lfll for driving the paddle. Any suitable form of bearing support may be provided for the shaft 94 and the sleeve 98. .By operating the three-bladed paddle 92 within the lower portion of the inner receptacle, sufllcient movement of the material to be filtered within the inner receptacle is provided to carry away solids from the screen 50 before the screen is solidly clogged. If the opposite side of the screen were not flooded, I do not believe that the agitating means would be able to remove the solid material from the screen 50 because the liquid head would tend to keep the solid material on the screen. Since the outside of the screen is flooded, this liquid head is eliminated and the tendency to clog is reduced and the agitating means can readily remove by circulation any solid material which might tend to collect upon the screen 50. This solid material thus remains in suspension within the inner receptacle and accumulates therein. When the material within the inner receptacle becomes too thick, it may be removed by opening the valve 10 after which a fresh supply of filterable material may then be introduced. A hand-hold with a removable cover W3 is provided in the large cover 38 and is fastened in place normally by the wing nuts I05.

For many purposes, it is desirable to connect two or three of such filtering devices in series as shown in Fig. 1. In such an arrangement all of the filters are the same, except possibly in size and in the fineness of the screens or filter material used.

While I prefer the filtering arrangement described in detail, it is possible to use other ar- ,rangements. For example, the material to be filtered might be introduced into the outer receptacle and the liquid removed from the inner receptacle. The agitating means might be located in either arrangement between the inner and outer receptacles instead or within the inner receptacle. It is also possible for the agitating means to agitate the screens instead of directly agitating the material.

I find that this filtering device will operate for a much longer time without any clogging difficulties than other types of filters with which I am acquainted. I have found that this filtering device is excellent for filtering reclaimed paint as well as for filtering other materials.

While the form of embodiment of the invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. A filtering device comprising an inner receptacle having wall portions of filter material, a confining wall portion surrounding and spaced from said wall portions of filter material for receiving any liquid which passes through the filter material, overflow type outlet means for maintaining a level of filtered liquid in said space between the wall portion of filter material and the confining wall portion sufflcient to keep the major portion of both sides of the filter material in a wetted condition and for removing the surplus of filtered liquid, an inlet entering said receptacle at a level above the level maintained by said overflow type outlet means, and mechanical agitating means located within said receptacle for mechanically agitating the liquid mixture to be filtered within said receptacle.

2. A filtering device comprising an inner receptacle having wall portions of filter material, a confining wall portion surrounding and spaced from said wall portions of filter material for receiving any liquid which passes through the filter material, overflow type outlet means for maintaining a level of filtered liquid in said space between the wall portion of filter material and the confining wall portion sufficient to keep the major portion of both sides of the filter material in a wetted condition, an inlet entering said receptacle at a level above the level maintained by said overflow type outlet means, mechanical agitating means located within said receptacle for mechanically agitating the liquid mixture to be filtered within said receptacle, and an outlet located in the bottom of said receptacle.

3. A filtering device comprising an inner receptacle having wall portions of filter material, a confining wall portion surrounding and spaced from said wall portions of filter material for receiving any liquid which passes through the filter material, overflow type outlet means for maintaining a level of filtered liquid in said space between the wall portion of filter material and the confining wall portion sufiicient to keep the major portion of both sides of the filter material in a wetted condition and for removing the surplus of filtered liquid, an inlet entering said receptacle through which the liquid mixture to be filtered may be supplied to said receptacle, and mechanical agitating means located within said receptacle for mechanically agitating the liquid mixture to be filtered to said receptacle.

WILLIAM PAULLIN MCDORMAN 

